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Financial Instruments - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Sep. 30, 2013
6 3/4 % Senior Notes Due 2020
Sep. 30, 2013
6.0% Senior Notes Due 2022
Nov. 27, 2012
6.0% Senior Notes Due 2022
Assets Sold under Agreements to Repurchase [Line Items]                
Fair value of long-term debt $ 738.5   $ 738.5   $ 762.0      
Carrying value of long-term debt 717.0   717.0   723.0     300.0
Interest percentage           6.75% 6.00%  
Debt maturity period           2020 2022 2022
Gain/Loss on remeasurement of contingent consideration 0 0 8.2 4.1        
Accretion expense $ 0.6 $ 0.4 $ 2.1 $ 1.5